DISPLAY DEVICE AND HEAD-MOUNTED DISPLAY

• Main Authors: YAGI SHUGO, TSUBOOKA MASARU, KANBAYASHI YUICHI
• Format: Patent
• Language: English; Japanese
• Published: 27.09.2021
• Subjects: ADVERTISING; BLASTING; CRYPTOGRAPHY; DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH ISMODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THEDEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY,COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g.SWITCHING, GATING, MODULATING OR DEMODULATING; DISPLAY; DISPLAYING; EDUCATION; FREQUENCY-CHANGING; HEATING; LABELS OR NAME-PLATES; LIGHTING; MECHANICAL ENGINEERING; NON-LINEAR OPTICS; NON-PORTABLE LIGHTING DEVICES; OPTICAL ANALOGUE/DIGITAL CONVERTERS; OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICAL LOGIC ELEMENTS; OPTICS; PHYSICS; SEALS; SIGNS; SYSTEMS THEREOF; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLEEXTERIORS; WEAPONS

To improve luminance uniformity.SOLUTION: A display device 10 comprises a light source 13, a lightguide plate 15 having a light incoming end face 15B and a light exiting plate face 15A, a display panel 11, and a lens sheet 20. A prism part 23 of the lens sheet 20 includes a plurality of unit prisms 23A having an apex 23A1 and a pair of slant faces 23A2, 23A3, and the plurality of unit prisms 23A include at least a plurality of apex unevenly distributed prism 26. The plurality of apex unevenly distributed prisms 26 include a light source-end side apex unevenly distributed prism 26A located on a light source end E1 side with respect to the normal direction, and an anti-light source-end side apex unevenly distributed prism 26B located on an anti-light-source end E2 side with respect to the normal direction and arranged so that the distance from the anti-light-source end E2 is the same as the distance from the light source end E1 to the light source-end side apex unevenly distributed prism 26A, and differing from the light source-end side apex unevenly distributed prism 26A in unevenly distributed amount of the apex 23A1.SELECTED DRAWING: Figure 4 【課題】輝度均一性の向上を図る。【解決手段】表示装置１０は、光源１３と、入光端面１５Ｂと出光板面１５Ａとを有する導光板１５と、表示パネル１１と、レンズシート２０と、を備え、レンズシート２０のプリズム部２３には、頂部２３Ａ１と一対の斜面２３Ａ２，２３Ａ３とを有する複数の単位プリズム２３Ａが含まれ、複数の単位プリズム２３Ａには、複数の頂部偏在プリズム２６が少なくとも含まれていて、複数の頂部偏在プリズム２６には、法線方向について光源端Ｅ１側に位置する光源端側頂部偏在プリズム２６Ａと、法線方向について反光源端Ｅ２側に位置していて反光源端Ｅ２からの距離が光源端Ｅ１から光源端側頂部偏在プリズム２６Ａまでの距離と同じになるよう配されていて光源端側頂部偏在プリズム２６Ａとは頂部２３Ａ１の偏在量が異なる反光源端側頂部偏在プリズム２６Ｂと、が含まれる。【選択図】図４